Reptiles of Colorado [USA] Related checklists:  USA Bibliography of the reptiles of Colorado Taxonomic history of the reptiles of Colorado Introduced species

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Citation: Midtgaard, Rune. RepFocus - A Survey of the Reptiles of the World. www.repfocus.dk (Compilation date: 14th April, 2023).

Checklist General remarks: The list includes only formally described species. Newly discovered, but still unnamed species are excluded. However, unnamed species or species unassigned to species level are included, if they are the only representatives of their genus in the region. Species counts exclude extinct and introduced species. Doubtful records, typically older voucher specimens of uncertain origin, have been excluded if considered questionable, as are records based on sources considered unreliable or controversial. Note: Your comments to the checklist (omissions, errors, etc.) are welcomed, preferably if they are provided with reliable references. If possible, please attach a pdf file of the relevant reference to an email addressed to:

	Lizards (Sauria)
	= endemicEX = extinct or assumed extinct Species References  Family Crotaphytidae (North American Collared Lizards) Genus Crotaphytus (Typical Collared Lizards)   Crotaphytus collaris Common Collared Lizard Behler & King 1979 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 McGuire 1996 Young 2011 Genus Gambelia (North American Leopard Lizards)   Gambelia wislizenii Long-nosed Leopard Lizard Behler & King 1979 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 Young 2011  Family Phrynosomatidae (North American Lesser Iguanas) Genus Holbrookia (Lesser Earless Lizards)   Holbrookia approximans Blue-bellied Earless Lizard Hammerson 1999 Maslin 1959 Schmidt 1953   Holbrookia maculata Common Lesser Earless Lizard Behler & King 1979 Douglas 1966 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 Young 2011 Genus Phrynosoma (Horned Lizards)   Phrynosoma bauri Eastern Short-horned Lizard Montanucci 2015   Phrynosoma brevirostris Great Plains Short-horned Lizard Behler & King 1979 Maslin 1959 Montanucci 2015 Schmidt 1953 Zamudio, Jones & Ward 1997   Phrynosoma cornutum Texas Horned Lizard Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 Price 1990 Young 2011   * Phrynosoma diminutum Colorado Short-horned Lizard Montanucci 2015   Phrynosoma hernandesi Greater Short-horned Lizard Hammerson 1999 Maslin 1959 Montanucci 2015 Schmidt 1953 Young 2011   Phrynosoma modestum Round-tailed Horned Lizard Hammerson 1999 Jones & Lovich (eds.) 2009 Ramotnik 1998 Rondeau 2002 Young 2011   Phrynosoma ornatissimum Southern Short-horned Lizard Behler & King 1979 Maslin 1959 Montanucci 2015 [ornatissimum X hernandesi] Schmidt 1953 Genus Sceloporus (Northern Spiny Lizards)   Sceloporus bimaculosus Twin-spotted Spiny Lizard Hammerson 1999 [as magister (part)] Maslin 1959   Sceloporus consobrinus Prairie Lizard Hammerson 1999 [as undulatus garmani] Jones & Lovich (eds.) 2009 Leache & Reeder 2002 Maslin 1959 Young 2011   Sceloporus graciosus Common Sagebrush Lizard Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 Young 2011   Sceloporus magister Northern Desert Spiny Lizard Behler & King 1979 Hammerson 1999 Jones & Lovich (eds.) 2009 Young 2011   Sceloporus tristichus Western Plateau Lizard Hammerson 1999 Jones & Lovich (eds.) 2009 Leache & Reeder 2002 Maslin 1959 Young 2011 Genus Urosaurus (North American Tree Lizards)   Urosaurus ornatus Common Tree Lizard Douglas 1966 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 Young 2011 Genus Uta (Side-blotched Lizards)   Uta stansburiana Common Side-blotched Lizard Behler & King 1979 Douglas 1966 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 Young 2011  Family Scincidae (Skinks) Genus Plestiodon (Blue-tailed Skinks)   Plestiodon multivirgatus North American Many-lined Skink Behler & King 1979 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 Mecham 1980 Young 2011   Plestiodon obsoletus Great Plains Skink Hall 1976 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 Young 2011  Family Teiidae (Greater Tejus) Genus Aspidoscelis (Northern Whiptails)   Aspidoscelis exsanguis Chihuahuan Spotted Whiptail Livo & Wilcox 2021   * Aspidoscelis neotesselatus Colorado Checkered Whiptail Hammerson 1999 Jones & Lovich (eds.) 2009 Walker, Cordes & Taylor 1997 Young 2011   Aspidoscelis sexlineatus Six-lined Whiptail Behler & King 1979 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin 1959 Young 2011   Aspidoscelis tessellatus Common Checkered Whiptail Behler & King 1979 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin & Secoy 1986 Walker, Cordes & Taylor 1997 Young 2011   Aspidoscelis tigris Tiger Whiptail Behler & King 1979 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin & Secoy 1986 Maslin 1959 Young 2011   Aspidoscelis velox Plateau Striped Whiptail Behler & King 1979 Douglas 1966 Hammerson 1999 Jones & Lovich (eds.) 2009 Maslin & Secoy 1986 Maslin 1959 Young 2011

	Snakes (Serpentes)
	= endemicEX = extinct or assumed extinct Species References  Family Colubridae (Typical Snakes or Colubrids) Genus Arizona (Glossy Snakes)   Arizona elegans Eastern Glossy Snake Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011 Genus Coluber (North American Racer)   Coluber constrictor North American Racer Behler & King 1979 Hammerson 1999 Maslin 1959 Wilson 1978 Wright & Wright 1952 Young 2011 Genus Diadophis (Ring-necked Snake)   Diadophis punctatus Ring-necked Snake Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011 Genus Heterodon (North American Hognose Snakes)   Heterodon nasicus Western Hognose Snake Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011   Heterodon platirhinos Eastern Hognose Snake Warfel 2011 Genus Hypsiglena (North American Night Snakes)   Hypsiglena chlorophaea Desert Night Snake Behler & King 1979 Hammerson 1999 Maslin 1959 Mulcahy 2008 Wright & Wright 1952 Young 2011   Hypsiglena janii Chihuahuan Night Snake Behler & King 1979 Hammerson 1999 Maslin 1959 Mulcahy 2008 Young 2011 Genus Lampropeltis (King Snakes and Milk Snakes)   Lampropeltis californiae California Kingsnake Hammerson 1999 Young 2011 [as getula]   Lampropeltis gentilis Northwestern Milk Snake Behler & King 1979 Douglas 1966 [as triangulum] Hammerson 1999 Markel 1990 Maslin 1959 Ruane 2015 Ruane, Bryson, Pyron & Burbrink 2014 Wright & Wright 1952 Young 2011 [as triangulum]   Lampropeltis holbrooki Speckled Kingsnake Boback, Link, Bergman, Hill, Montgomery, Hobert & MacKessy 1996 [as getula] Hammerson 1999 [as holbrooki X splendida]   Lampropeltis splendida Desert Kingsnake Hammerson 1999 [as holbrooki X splendida] Young 2011 [as getula] Genus Masticophis (North American Whip Snakes and Coachwhips)   Masticophis flagellum Common Coachwhip Behler & King 1979 Hammerson 1999 Maslin 1959 Wilson 1973 Wright & Wright 1952 Young 2011   Masticophis taeniatus Western Striped Whip Snake Camper & Dixon 1994 Hammerson 1999 Maslin 1959 Parker 1982 Young 2011 Genus Nerodia (North American Water Snakes)   Nerodia sipedon Northern Water Snake Behler & King 1979 Gibbons & Dorcas 2004 Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011 Genus Opheodrys (North American Green Snakes)   Opheodrys vernalis Smooth Green Snake Douglas 1966 Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011 Genus Pantherophis (North American Rat Snakes)   Pantherophis emoryi Great Plains Rat Snake Behler & King 1979 Dowling 1952 Hammerson 1999 Maslin 1959 Schulz 1996 Wright & Wright 1952 [as intermontanus] Young 2011 Genus Pituophis (Bullsnakes, Pine Snakes and Gopher Snakes)   Pituophis catenifer Gopher Snake Behler & King 1979 Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011 Genus Rhinocheilus (Long-nosed Snakes)   Rhinocheilus lecontei Common Long-nosed Snake Behler & King 1979 Hammerson 1999 Maslin 1959 Medica 1980 Wright & Wright 1952 Young 2011 Genus Sonora (North American Ground, Sand, and Shovel-nosed Snakes)   Sonora episcopa Great Plains Ground Snake Behler & King 1979 [as semiannulata] Cox, Davis Rabosky, Holmes, Reyes-Velasco, Roelke, Smith, Flores-Villela, McGuire & Campbell 2018 Frost 1983 [as semiannulata] Hammerson 1999 [as semiannulata] Maslin 1959 Wright & Wright 1952 Young 2011 [as semiannulata] Genus Tantilla (American Centipede Snakes)   Tantilla hobartsmithi Southwestern Centipede Snake Cole & Hardy 1981 Cole & Hardy 1983 Hammerson 1999 McCoy, Knopf & Walker 1964 [as T. utahensis] Tanner 1966 [as T. planiceps utahensis] Wilson & Mata-Silva 2014 Wilson & Mata-Silva 2015 Young 2011   Tantilla nigriceps Plains Centipede Snake Cole & Hardy 1981 Hammerson 1999 Maslin 1959 Wilson & Mata-Silva 2014 Wilson & Mata-Silva 2015 Wright & Wright 1952 Young 2011 Genus Thamnophis (North American Garter Snakes and Ribbon Snakes)   Thamnophis cyrtopsis Black-necked Garter Snake Behler & King 1979 Hammerson 1999 Maslin 1959 Rossman, Ford & Seigel 1996 Webb 1980 Wright & Wright 1952 Young 2011   Thamnophis elegans Terrestrial Garter Snake Douglas 1966 Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011   Thamnophis proximus Western Ribbon Snake Behler & King 1979 Hammerson 1999 Maslin 1959 Rossman 1970 Rossman, Ford & Seigel 1996 Wright & Wright 1952 Young 2011   Thamnophis radix Plains Garter Snake Hammerson 1999 Maslin 1959 Rossman, Ford & Seigel 1996 Wright & Wright 1952 Young 2011   Thamnophis sirtalis Common Garter Snake Behler & King 1979 Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011 Genus Tropidoclonion (Lined Snake)   Tropidoclonion lineatum Lined Snake Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011  Family Leptotyphlopidae (Thread Snakes) Genus Rena (Maroon Thread Snakes)   Rena dulcis Texas Thread Snake Davenport, Ehrenberger, Triece, McMullen & Johnson 2020 Hammerson 1999 Lapin & Hammerson 1982 Montgomery, Montgomery & Mackessy 2013 Young 2011  Family Viperidae (Vipers) Genus Crotalus (Typical Rattlesnakes)   Crotalus concolor Midget Faded Rattlesnake Behler & King 1979 Campbell & Lamar 2004 Hammerson 1999 Maslin 1959 Young 2011   Crotalus viridis Prairie Rattlesnake Campbell & Lamar 2004 Ernst 1992 Hammerson 1999 Maslin 1959 Wright & Wright 1952 Young 2011 Genus Sistrurus (Pygmy Rattlesnakes)   Sistrurus tergeminus Western Massasauga Behler & King 1979 Campbell & Lamar 2004 [as catenatus] Ernst 1992 Hammerson 1999 Maslin 1959 Minton 1983 [as catenatus] Wright & Wright 1952 Young 2011 [as catenatus]

	Turtles (Testudines)
	= endemicEX = extinct or assumed extinct Species References  Family Chelydridae (American Snapping Turtles) Genus Chelydra (American Snapping Turtles)   Chelydra serpentina North American Snapping Turtle Hammerson 1999 Maslin 1959 Rhodin, Iverson, Bour, Fritz, Georges, Shaffer & Dijk 2021 Young 2011  Family Emydidae (Western Pond Turtles) Genus Chrysemys (American Painted Turtle)   Chrysemys picta American Painted Turtle Hammerson 1999 Iverson 1992 Maslin 1959 Rhodin, Iverson, Bour, Fritz, Georges, Shaffer & Dijk 2021 Stebbins 1985 Young 2011 Genus Terrapene (American Box Turtles)   Terrapene ornata Ornate Box Turtle Hammerson 1999 Maslin 1959 Rhodin, Iverson, Bour, Fritz, Georges, Shaffer & Dijk 2017 Rhodin, Iverson, Bour, Fritz, Georges, Shaffer & Dijk 2021 Young 2011  Family Kinosternidae (American Mud and Musk Turtles) Genus Kinosternon (American Mud Turtles)   Kinosternon flavescens Yellow Mud Turtle Hammerson 1999 Maslin 1959 Rhodin, Iverson, Bour, Fritz, Georges, Shaffer & Dijk 2021 Young 2011  Family Trionychidae (Softshell Turtles) Genus Apalone (North American Softshell Turtles)   Apalone mutica Smooth Softshell Turtle Johnson, Livo, Kruetzer, Kruetzer, Berardi, Warfel & Dubois 2019 Maloney 2020   Apalone spinifera Spiny Softshell Turtle Behler & King 1979 Hammerson 1999 Iverson 1992 Maslin 1959 Rhodin, Iverson, Bour, Fritz, Georges, Shaffer & Dijk 2021 Young 2011